Time and layer resolved magnetic domain imagig of FeNi/Cu/Co trilayers using x-ray photoelectron emission microscopy (invited)

Vogel, Jan; Kuch, W.; Camarero, Julio; Fukumoto, Keiki; Pennec, Yan; Bonfim, Marlio; Pizzini, S.; Pétroff, F.; Fontaine, A.; Kirschner, J.

doi:10.1063/1.1676027

Cited by 19 publications

(22 citation statements)

References 10 publications

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“…For example, unprecedented spatial and temporal resolutions have been obtained recently: SP-STM now allows insights into magnetism down a e-mail: nicolas.rougemaille@grenoble.cnrs.fr to the atomic scale [20,21], while magneto-optic Kerr microscopy has the potential to probe dynamic processes in the femtosecond range [22]. Moreover, the spectroscopic resolution of several microscopy techniques based on synchrotron radiation enables element-specificity and layer selective imaging of magnetic heterostructures [23,24]. The significant progress in magnetic imaging opens new windows into a host of scientific questions, including phenomena of nucleation and propagation of magnetic domains and domain walls, magnetic phase transitions, magnetic coupling in multilayers, magnetization dynamics, etc.…”

Section: Introductionmentioning

confidence: 99%

Magnetic imaging with spin-polarized low-energy electron microscopy

Rougemaille

Schmid²

2010

Eur. Phys. J. Appl. Phys.

115

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Abstract. Spin-polarized low-energy electron microscopy (SPLEEM) is a technique for imaging magnetic microstructures at surfaces and in thin films. In this article, principles, advantages and limitations of SPLEEM are reviewed. Several recent studies illustrate how SPLEEM can be used to investigate spin reorientation transition phenomena, to determine magnetic domain configurations in low-dimensional structures, or to explore physics of magnetic couplings in layered systems. The work highlights the capability of the technique to reveal in situ and in real time quantitative information on micromagnetic configurations and structure-property relationships. In addition, spectroscopic reflectivity measurements with spin-polarized low-energy electron beams can be a useful tool to probe spin-dependent unoccupied band structure of magnetic materials and electronic properties of buried magnetic interfaces.

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Section: Introductionmentioning

confidence: 99%

Magnetic imaging with spin-polarized low-energy electron microscopy

Rougemaille

Schmid²

2010

Eur. Phys. J. Appl. Phys.

115

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“…To date, the existence of induced ferromagnetic domains in an otherwise nonferromagnetic barrier has, however, not been proven. For that, conventional sample averaging methods such as superconducting quantum interference device (SQUID) or Kerr magnetometry or magnetic spectroscopies with in-depth spatial resolution such as polarized neutron reflectometry, must be supplemented by element-specific and magnetic-sensitive X-ray magnetic circular dichroism (XMCD) combined with microscopy techniques such as photoemission electron microscopy (PEEM) 21 with lateral spatial resolution.…”

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confidence: 99%

Insight into spin transport in oxide heterostructures from interface-resolved magnetic mapping

et al. 2015

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At interfaces between complex oxides, electronic, orbital and magnetic reconstructions may produce states of matter absent from the materials involved, offering novel possibilities for electronic and spintronic devices. Here we show that magnetic reconstruction has a strong influence on the interfacial spin selectivity, a key parameter controlling spin transport in magnetic tunnel junctions. In epitaxial heterostructures combining layers of antiferromagnetic LaFeO 3 (LFO) and ferromagnetic La 0.7 Sr 0.3 MnO 3 (LSMO), we find that a net magnetic moment is induced in the first few unit planes of LFO near the interface with LSMO. Using X-ray photoemission electron microscopy, we show that the ferromagnetic domain structure of the manganite electrodes is imprinted into the antiferromagnetic tunnel barrier, endowing it with spin selectivity. Finally, we find that the spin arrangement resulting from coexisting ferromagnetic and antiferromagnetic interactions strongly influences the tunnel magnetoresistance of LSMO/LFO/LSMO junctions through competing spin-polarization and spin-filtering effects.

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“…The magnetic contrast is caused by the difference in x-ray absorption of magnetic domains having their magnetization parallel or antiparallel to the direction of the incoming circularly polarized x-rays. X-ray imaging techniques have been used to investigate magnetization dynamics mainly in permalloy structures [10,11], but the chemical selectivity that can provide layer-resolved imaging has been little exploited [12,13].The measurements were performed at the UE52-SGM and the UE56/2-PGM2 helical undulator beamlines of the BESSY synchrotron radiation source in Berlin, Germany. Temporal resolution was obtained using a pumpprobe scheme, like in our previous time-resolved XMCD measurements [2].…”

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confidence: 99%

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confidence: 99%

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Interplay between magnetic anisotropy and interlayer coupling in nanosecond magnetization reversal of spin-valve trilayers

et al. 2005

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The influence of magnetic anisotropy on nanosecond magnetization reversal in coupled FeNi/Cu/Co trilayers was studied using a photoelectron emission microscope combined with xray magnetic circular dicroism. In quasi-isotropic samples the reversal of the soft FeNi layer is determined by domain wall pinning that leads to the formation of small and irregular domains. In samples with uniaxial magnetic anisotropy, the domains are larger and the influence of local interlayer coupling dominates the domain structure and the reversal of the FeNi layer.PACS numbers: 75.60. Jk, 75.60.Ch, 85.70.Kh, 07.85.Qe Magnetic trilayers in which two thin ferromagnetic films are separated by a non-magnetic spacer layer present a variety of effects -giant magnetoresistance, tunnel magnetoresistance, spin torque transfer -that make them highly interesting for both fundamental studies and applications. Recent studies of magnetization dynamics of trilayer systems like spin valves (SV) and magnetic tunnel junctions (MTJ) [1,2,3,4,5] are mainly motivated by magnetic recording and memory applications, since the switching speed of their active magnetic element, the soft ferromagnetic film, can ultimately limit the rate at which information can be read or written in the devices. At nanosecond timescales, the magnetization reversal of ferromagnetic layers is determined by processes like nucleation and domain wall propagation that are strongly sensitive to the magnetic anisotropy of the film. In magnetically coupled trilayers, also the interaction between the magnetic layers influences the reversal. Despite the fundamental interest of these effects and the consequences for technological applications, few studies have been published on the influence of interlayer coupling and anisotropy on the fast magnetization reversal of magnetically coupled trilayers [6,7,8]. In this paper, we show that the magnetic anisotropy within the plane of the layers has a large influence on the shape of the magnetic domains and on the domain wall dynamics, as well as on the correlation between the domain structures in the soft and hard magnetic layers. In quasi-isotropic samples the application of nanosecond magnetic pulses gives rise to small and irregular domains in the soft layer. This leads to a large density of 360• domain walls and consequently to a large increase of the saturation field. This phenomenon can be avoided using layers with a uniaxial magnetic anisotropy.We have independently studied the nanosecond magnetization reversal of the soft permalloy (Fe 20 Ni 80 ) and of the hard Co layer in spin-valve like FeNi/Cu/Co trilayers using time and layer-resolved photoelectron emission microscopy (PEEM) combined with x-ray magnetic circular dichroism (XMCD) [9]. In XMCD-PEEM secondary electrons emitted from the sample surface after resonant absorption of circularly polarized x-rays are collected in an electron microscope to obtain an image of the magnetic domain structure. The magnetic contrast is caused by the difference in x-ray absorption of magnetic domain...

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Time and layer resolved magnetic domain imagig of FeNi/Cu/Co trilayers using x-ray photoelectron emission microscopy (invited)

Cited by 19 publications

References 10 publications

Magnetic imaging with spin-polarized low-energy electron microscopy

Magnetic imaging with spin-polarized low-energy electron microscopy

Insight into spin transport in oxide heterostructures from interface-resolved magnetic mapping

Interplay between magnetic anisotropy and interlayer coupling in nanosecond magnetization reversal of spin-valve trilayers

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